• Diseases of the endocrine system involve the secretion of too much or not enough hormone.
  • When too much hormone is secreted, it is called hypersecretion.
  • Hypersecretion by an endocrine gland is often caused by a tumor.
  • For example, a tumor of the pituitary gland can causehypersecretion of growth hormone.
  • If this occurs in childhood, it results in very long arms and legs and abnormally tall stature by adulthood.
  • The condition is commonly known as gigantism.
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